Yep! It’s quite common that most people don’t know this since the games are old and even if you have played them it isn’t common knowledge that the EXP ALL even exists!
Haven’t played the demo yet so I have no comment on the bugs, just wanted to clear up the exp share info. You are certainly correct about levelling up individual pokemon faster by turning it off which I did not know.
Actually, the Exp Share has always been in the game since Gen 1. It was called the EXP ALL in Gen 1 and it wasn’t a held item. It distributed 50% of Exp gained between all non-fainted Pokemon in the party. It was renamed to Exp Share in Gen 2 and became a held item.
